C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/12 (2006.01) C07C 51/56 (2006.01) C07C 53/08 (2006.01) C07C 53/12 (2006.01)
Patent
CA 2053828
A continuous process is indicated for the simultaneous preparation of acetic acid and acetic anhydride from a starting mixture of methanol and methyl acetate and also, optionally, dimethyl ether, by reaction with carbon monoxide under anhydrous conditions at temperatures of 150 to 250°C and under elevated pressure in a reaction zone on a dissolved catalyst system containing a nickel compound, methyl iodide as promoter, at least one co- promoter, such as an alkali metal iodide, quaternary phosphonium iodide or quaternary ammonium iodide, and a co-catalyst, which process comprises using, as co- catalyst, a rhodium or iridium compound in a molar ratio of nickel: co-catalyst of la (0.005 to 0.1), adjusting the nickel concentration in the reaction zone to 0.01 to 0.1, preferably to 0.015 to 0.06 mol/l, and operating under an elevated pressure of 30 to 100 bar.
Erpenbach Heinz
Gradl Reinhard
Jagers Erhard
Seidel Andreas
Celanese Gmbh
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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